Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8bd43913804cfe0703a4d6e9ebe0b283b68fb4c6bec4146cede89d04e7c82c' 
  AND token = '1TEgnIxkyTj4mQCX9AjenU7vmkrqGq2ztqbj7W7aBGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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