Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f47d7c3319e041b80a3dbe1fd5d0e19e6b7f4b1533f7dc0b4042c3e447b655' 
  AND token = '/VySIdmajbx9eCTeUK+3RwG3rMq1ZsmS89rbeEq4020=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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