Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cdc11fcacf6f9a96e287bd08a2a5eda36c666b94cb44bbe9720cf2a4b11278' 
  AND token = 'C8PYvM5PCiq/+JT3DRnYQJO6PHC9N4e/f1YU8bg8T/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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