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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3143a4c20d0cf9a9741e249fa64badb817263fdc4b6b995f8379d99c69ab789d' 
  AND token = 'GBinj9TvRsTjdyq5pbZ4WxiIf32DWpFV3MM+pC0uFEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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