Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1e9ed43f3341a333e02e33ef20f556e0e6ba69163b7d7ad18ee388292698e7ac' 
  AND token = '6FQl5AGj66r0v/j/zQTTtEMsTbHjIsQpdpBXgXnO1Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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