Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b30883d76f1eb4854cddd8d954502e4dc36270a458505895c4af2c4390ea039' 
  AND token = 'cA5MboBqzKEHDebXA5B+OoffE+frwnofd2mfoY6rr8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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