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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8b58f09273ea9b72f30d7e2e4681d914cb2a413f674d1a1b22c9af9f3800e911' 
  AND token = 'vNsxf+db3KxFnn9TDh8XwSH0sLHvAw5r5zOX9I2jdgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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