Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e1c1096c29f21b6c65605f4385e18fff8ca4a47d2b7fb90cf3631b4d9c4a69' 
  AND token = 'B2sIy9hIKy6aDpENRWgy02su5OBfYA88UPtg+JB92is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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