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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fcd3c2ca17c62ddde173061d157b91541463319e1737a433238abc16c1b769f' 
  AND token = '+mGULXxA5/552Sqyp3IKAc8JiUyUrQdUz3Xn8TdqS+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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