Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d2df2694e2dd5a005ae817ffb08b8bf89253ac871104a0be122f92a0d976ba' 
  AND token = 'VXTJ4aLUcT3LRzFeiTLSCMXmSla8lZIGtmTL1kodzDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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