SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9487a05d43d78b848a4882c73166627b67c420e7c2a52c84e9cc3840563a0b75' 
  AND token = 'w/4Ci1O4D2S8nxK8pFNSRlPyzQ+JpBPDZ0O4PApHTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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