Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0475281a7007caf706258ac9d8fda23b7de31f89c7798545e436a9484042758' 
  AND token = 'zY7vtlEOxqxduSfSjb+MXBtQ7251K3OhGrjd13NrVTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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