Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a71b29b211c68a55bd10e06fb800fe92771e370d253b3f3b0944c293281ba91' 
  AND token = 'FOdD5teHFupVO1flAtpSPuKY+6bRCLk0EUcp2LagK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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