Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5caff1a430cfcf6f976d80d77f0943ffdd8baf3a709c8cc24be9319e31ea765' 
  AND token = '8NWqxVZZjNdmIJ4PDe6hnwhH7AV3fOhjSb+2WeHRZDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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