Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b79c7554b1c6d650698de30b7fe2d6254851d4596a9b3261d62167f85ecc0c' 
  AND token = 'maFxuIY302PX240Uavset9Fy5ELTsb8cPEKtsyVjwpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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