Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9907728df601292d12a07999333d6aa05fe537b5ede7230a2a7bbc1f825e9ba' 
  AND token = 'k4hJsFa5w1yhlIX54nt4I7H2K1+xhFfvQyx3Vi2ilvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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