SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2e7fa5dbcfa54758a52992f3169c713b91394ec7209b6d1219a86da32111a8e4' 
  AND token = 'p3zV00UnkKi6EFkX8/fYiWhOOsJLm50PALfH1tqUTM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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