Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8788644d14bacab98f182e0524502fc4fee97c4f5807d9fd285fba5e1aa0dbb1' 
  AND token = 'dCbhHUVxZ1Kdu5FQzRGyPZ283YWh3rJRp+YhtnNDbRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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