Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a14221529f91e5069f17a05aa2c892cbe3f78264e106ce716eafa3cf42dae48' 
  AND token = 'uCuBHey4R3ghQZ1jlP5bkzGAdmkpYOzG3TxI7S3xIUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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