Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ded07333abe614ef2bdb383c27d247e9e40eab2750c2954256badf176c34cb' 
  AND token = '6XxMN/K/Wf+k2c4ISoMCvhmN6ZLt36657TpQYuoAHOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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