Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb5acf5a8e6dd6aca32a71060c90197e263d84a61e3566e76b7473bb1903bc4' 
  AND token = 'wfnVgSkABiCG8AS+6rdh7YWTeoGQ9NigwNLLbriUACY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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