Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8a45cbaaf7a8e5bffe634cf305559b126464cae0581344283f5d9836739b5f28' 
  AND token = '6AnhzQzWYz3AWJagBxceB9t6zyfgDxQ9QwMmAoqBSoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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