SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '984c1d728f92f77c7c372a3276922b58d875c26b311e838a5efcfe430d32fa4e' 
  AND token = 'awfdlSsTIILq08hMGVIHPmO5CbMZ+SyTKu3yj16eMFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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