Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a489eea2a4a948b5c9fb53011a7c957dc8a10d510862138278e088b591182d' 
  AND token = 'YtIjjSWc+UdlLTfQuoDe1eQCaj4ueS2oo+doWE5F95o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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