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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4414e7a89be36e3eb295e543a596ca9a88da3e6bab4b2ced4a159e5b01479c9c' 
  AND token = 'ZEozZxpUxb0QJyJA6vg6MnAvEFJx9RPp0C53CV1mMJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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