Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c81a7a169c5322d83b1c86b5b131da6c6846e4e59f3a8748c398e2c36ce5c7b' 
  AND token = 'Zyt6FiRwt9A9miA5hjQb0JoCeFE2jTpyQAPqehOndHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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