SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3e7c8f62d8af6e974cb27b817cf1aa8a909590ffe53592e6519060a6a9f0a7a7' 
  AND token = 'ZGgzIEZFE5mZEjU9nLacgdKU2JHFgd1BEENOGfVlzwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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