Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63ad2db49dea96c96e4a8ffbc004ede4f1e806b412d0fccf29c43b2e02c6b27' 
  AND token = 'edlLM7lz0wAinbjnB3JY+PH136inlenyGcISGbfMNy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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