SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'de1a1464dd047a25c7c80e0fa192ada0398480f2f4514bb41abe3c1902efb978' 
  AND token = 'OJXcbVPDOyJMrD6KDiau/wJix9UlzS1vNwKXy67b3Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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