Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9888ac436cf5ebcaa966274512d493aebde7ed91523d33df3102860399dec724' 
  AND token = 'yfSjzxKwSoZfPNg66wtmp7LFOoRzBVMoAskH9B8Ales=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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