Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44dca599c06855fd26e85e22802f1cf6fdfc409a29b5823f0e5d1e51a93bd29' 
  AND token = 'Dvd0SuD0X5YoHt6zINGXme7NE7dNRrnrsGozkhXb+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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