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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7df79bacbd03dc2e81249e3f49f07cf5003a2b6b7cc037e493d9b9f2f0e7833f' 
  AND token = 'XcKzbl2qvUyNR443xclP2LbqsoXifp/7AgPQ2dAh+6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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