SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ef9a0ff014d3282ce4a34ca2afca828ed7630ae7164b6f59655892cdc2a76e43' 
  AND token = 'BPB4NAqkgEDagU+PeJnlpoX/Z7sMsXsOFV5kxmksUQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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