Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49946c01b76d40d0f0c90040779a3b6cd7ae74d2f0b6f1c773a480d069bf5737' 
  AND token = '3HKtYEYsZ1MOW8YUgm7LrdQhtF+L2G2pSzNWmajQqXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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