SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0b92ae3059109f1f0a87cba54a2a03787ebc7921bfffb608dfecb76c7f2d55cc' 
  AND token = 'rzA7shuvhV1tw2A8hhGoJSuHCqL7441jw/iLHcXhZ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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