Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad35cc18af145b20642a76bb28265db67fff1893e0e0c90080a06b865a6e933' 
  AND token = '3CvZ5F0ijyRLsb0g1bdQTE/vbFci5rpqswrTS8trFrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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