Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9bec78940287b57707e9c59b7263c3317fef606c50e01e635aa81632cbff37' 
  AND token = 'v8wvnmE2a4z7AL1cKrKTBq8ooDGEJNzcTD3CAkUVgdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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