SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c684828f961751946d78f8506c486d36659b79b29df235ef5bd5c90c844a4d66' 
  AND token = 'O23LbqJc7GY9iPYQSpBgh/Ty2/jnmKj41sxInvJn+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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