Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4878a4f045bffc8fafb6a3e4d5e7c6587520f8d99907e7ac26289ac103a7f7ed' 
  AND token = 'MXGiQQHpE3duMku6XrNeJQwG9/tMaYoHy9MKFfc1lgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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