Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dc56e648c0a626ede568220d7c2894787e50ac5bc6096dcc08de4797f65262' 
  AND token = 'u62N8UAnq9K1NFGa37rRFCWDmCCGbsY1wyuRVr638TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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