Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfd3b216d7b27b162ffb16be91366557029f5dc67bc5741e9e48f841f26602a' 
  AND token = 'mK2yCZBq8E+aFUTj6M0EE+/41czbVbxkEffBBKxyl7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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