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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3170105f7fafe7d695689b9a4b5d89f403ceb804d814d5149188a61cddbf28d8' 
  AND token = 'd3JcVd9MUyy/7DgUf6E6uDS900+5G8n2j1QY9L3ZHN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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