Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9177e3550efa7b56a8f792815c223257b2f4eb63535f8f2710be483679e27bae' 
  AND token = 'CCkfPLLVW28IagbbfYVoRYSVxzKFdAaYZaSP1kh3MvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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