Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d18fabb4b6040772bb5b47bf5dffd9c6974af7a831fb40d4191de43a7c475a' 
  AND token = 'KTyJ1jUnxdnCCCrG4Bid1FBUSfIW5k6sSdxDyEWxnm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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