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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8519d70b82312fbf94d82222a146b6ce53cfbded175f09a0016b05e19e9c71e9' 
  AND token = 'S47jLnurahSvOWsPKrC+73BBuH8mFN4OkXQ5ecVrjFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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