Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af8eaadb90486d9fb385fa116af078fe7d3ae3a3cee9151edd91c41eed7544f' 
  AND token = 'lP0AvuTAzgv26KOKp7SicBELs8ftres6j14+FdAKLmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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