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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'afe006755dd78981f4778ed83a62ef03f9100fc741cdfe599b69d06658822b3f' 
  AND token = '5U+R8Lvv4me3CDRKpjjddnYv7J1bMEu+OhSjmpodb/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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