Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4036036f79e83a2c573608e65c53ddc3b7e7500d67e24131b8bf558b13d42a' 
  AND token = 'IxsR+S/kfMjw9fHiSDw/stmYzO2VRBkiaVUwtg5u0dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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