Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae77b857a0ebdffc85beaeb6c6188da8439fc6dba2120adb2130d5edc07f6cf' 
  AND token = 'tMnRnLM4dRlRKp57iu4bDWR+0eTRzahHIFWubTYC8ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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