Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3177cb81f9c239ab7281745d83d19c976a34f33bae39e10c8955ad7951844684' 
  AND token = '/O/DJ+XWJhBSyedVjHX69cFL3fnBgQoOxJ3/C8Jzy48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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