Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4887178554ebb1b606e007ff4d72185450738d246b135827d194d05aa31b0f' 
  AND token = '7PZHGVRedvz7dahe+lUyEgThiP9pz/Z3XAzcI6LPo8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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