Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1f6bbc1a6f0dd73dc06ab7e5bb7a08f44a4a0d012cba9944f82f588ef47177' 
  AND token = 'gZtpJyReJ9a80oPVrvHpW2iYfNuUnByY4OsvURzzlyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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