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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d9d12cefbe34733cbbcdb04be8e896a31a32ec518662885ecd28704d39ad8a2' 
  AND token = 'x5yi8jC1R6GZmaDA5g8U67Jyfn8hBNyilZnx5lEi6gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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