Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '486ee7c76e536a41ef5ab98f16a01e0cd21ea21a753d6f88ba3c763163c752fb' 
  AND token = 'kjh7DLpcQUubMubhzedUVakkoJGarJzOmpSsvKBbBXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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