SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3f63a032b8b1f2cf33fdca7276a5a475c47f7f882ffed0e537259bb818094c08' 
  AND token = 'q2FOEkzyjyWjT7kSEFXW1OQKd+cpLwXGqZq9P3haPBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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