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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '14947da58761e01d3443cba7f850e7c91237f6557dd4ff37e3de7330c43eb513' 
  AND token = 'Cf1W7CWporBOC8QOwa0vMZTMHPPNCRdSxFo8BUj4yjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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