Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cc16e4866584950561ac1b07a9fcaa02d84bffd1298125e9bbd893e6c3e1cd4' 
  AND token = 'eNeB+D2Cyt7b4/KbfFHFDNOgzLvoLcI3izgBoVMuwHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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