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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '06317d64820e2026bfbae998f83a6c0a3f73ae3e70e702c523d4052911f9e6c5' 
  AND token = 'MAqw9xMP3TXXJzpiH9eG70SWAjNte4ymTmNtfQIL2yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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