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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a7f196d6a7d9925ecd4687c36ac1430105b14552c97f404a8a87edd50ecaa487' 
  AND token = 'MsFyS37dRJXF6caBkWPZH8numNzpTlwZuXZG1vnOzlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}