Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582b6c52bbf899197530affeebce10d056ef7d6c10d851f6ce0e50b052a131b4' 
  AND token = 'uTiLT2kDeKPIEi9OpCjugSXQl90ZxMGiTcnUterux4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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