Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66385a42cca2a3d8b57997ee6402beaaa3aac1b44be420149fdcb3a0ae0effc2' 
  AND token = 'gH31B+7aTZyz6AHXwUx0rDU89RoQo2cs5ILBNowxVm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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