SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '003e163611a2eb1290419ea3e261ec80b8fbc01831788627ebe551c0b50ec00b' 
  AND token = 'P4hYdzWR4tNYNXLvmQApsGgK9xGk3KoQVNhKCiNqWGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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