Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4fbf95cfd49254d2842ee8bb65bdce70b6e5613aa612d3f2b65571b63561e5' 
  AND token = 'kZ7kuC6FuKpldIkPS9X2pvQ/rKZUvdz1CHNfiIK6cU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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