Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e81d6419744b03d97dd9126db5681255ee582e79e3d9ab1c475f37a6595b9a24' 
  AND token = '+G646mkZRRNaQInGNk31N+tLwBoYqF3sDPqeP0zlpOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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