SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e19cde57da6c4ec32d012d7b16be1becb8602024af0d5f5987c879d5f3c6252f' 
  AND token = 'dhsxT1HmJxzsiKCtryT0+vhTL2TFx7N8LUqTLwvItGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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