Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5cfcf561490082a8dc55b65b46ed6dee0a772253af5ec3a36feca15c42e4323' 
  AND token = 'C+czki08/RuTtyIgHqngScDj3R3wruq/F3Gmcj02M4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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