SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a04af834e2c8fbe7c09a239685ca34ebfc5e14fafcc40115992729b7133e5f64' 
  AND token = 'IBwNhdhmz+s4YaHNU2uwcVgdggrhH7GMB2lwfaZypr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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