SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97954cfbda4b27237c22eb82e4f6bc763c92a15fdaf78ab83a704c14c9ab9e47' 
  AND token = 'qKYZq9QMBZgqiSgm1g8+B6uv8YhGsPvqhyZywBPHWtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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