Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f858f9178deb4bec8c813ff8e4a50202c5d9753acad50a3cc09f4e320858cb05' 
  AND token = 'HEorpNT/5W616iXuHYcbILf/UfZIFwj7hZcyL7FohPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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