Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb4fb29c7003591348d83fead31bab88ba5ba65a783c222d52fba263f25df803' 
  AND token = 'LybROcu3QlDmSK8DekirR7ARIbNo048rgLP4FgRWlug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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