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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '45c2297cc4766cb8b238ab86cbf48dc5a6f4cad7a5ead661c28684804b9d9c98' 
  AND token = '+fjZqNYhMYhgQMXqQ8pEpH+OaMG8becRMA+d8shlh70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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