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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '7986eb86946cd4c78a5dff74d2993445a68e69b7977c7523bca1a150c782c6fe' 
  AND token = 'CFHpzEXisd/yPeWucc/1Ud+4QE1KocDB79Hnv7Q5pQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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